FEATURES The Model 182 Sensitive Digital Voltmeter is a fully-programmable instrument with 1nV sensitivity. The Model 182 provides highly-accurate, stable, low-noise readings on five ranges for DC voltage measurements between 1nV and 30V. » Special input characteristics: Low common-mode current and RFI for minimal undesirable effects on sensitive circuits. Fast open input recovery places the input preamp in a nonsaturating state when the inputs are open while the instrument is in the one-shot mode. • High-sensitivity, low-noise measurements: The Model 182 has a resolution of 1nV on the 3mV range at 6 1/2-digit resolution with only 15nV of noise. • Selectable integration periods: Choice of 3msec, line cycle, and 100msec integration periods allows the best compromise between measurement speed, resolution, and noise. • Standard IEEE-488 interface: The built-in IEEE-488 interface allows the instrument to communicate with and be controlled from a computer. • 1,024 Reading Buffer: The 1,024-reading buffer can be programmed and data can be recalled from the front panel or over the IEEE-488 bus. The buffer can be programmed to store from 1 to 1,024 readings or on a continuous basis. Mean, maximum, minimum, and standard deviation values are also available. - Analog output: The analog output, which supplies a 3V full scale analog of the measurement at the reading rate, is available on the rear panel. User-programmable gain and relative features for optimized use of external analog recording devices such as chart recorders. • Digital filter: The 3-pole digital filter can be used to minimize reading noise. Filter response can be tailored for the best compromise between speed and noise reduction. • Reading Relative: The relative feature can be used to null offsets to optimize measurement accuracy, or to store and subtract a baseline value from subsequent readings. • Digital calibration: Allows easy calibration of instrument voltage measurements and the analog output without having to remove the top cover.